import re
import random

from django.contrib.auth import password_validation
from django.core.paginator import Paginator, EmptyPage

from admin_manager.models import OptionModel, PageModel, FooterLinkModel
from content.models import CataLogModel


def gen_verify_num():
    """
    ret: (ver_string, result)
    """
    first_num = random.randint(1, 100)
    last_num = random.randint(1, 100)
    action = random.choice(['+', '-'])

    ver_string = '%d %s %d =' % (
        first_num, action, last_num
    )
    if action == '+':
        result = first_num + last_num
    else:
        result = first_num - last_num
    return ver_string, result


def set_verify_num(request):
    """
    为当前请求设置验证码
    :return: very_code字符串
    """
    ver_code, result = gen_verify_num()
    # 记录结果
    request.session['ver_code'] = result
    return ver_code


def get_verify_num(request):
    """
    从请求的session获取验证码
    :param request: request对象
    :return: session里面保存的very_code
    """
    return request.session.get('ver_code')


def get_bbs_option():
    options = OptionModel.objects.filter(enable=True)
    pages = PageModel.objects.filter(enable=True).values('name', 'url', 'icon_code').order_by('-priority', 'pk')
    footer_links = FooterLinkModel.objects.filter(enable=True).values('name', 'url').order_by('-priority', 'pk')

    ret_dict = {option.code: option.value for option in options}
    ret_dict['pages'] = pages
    ret_dict['footer_links'] = footer_links
    return ret_dict


def global_settings(request):
    if request.user.is_authenticated():
        user_info = request.user
    else:
        user_info = {}
    catalogs = CataLogModel.objects.order_by('-priority', 'pk')
    return {
        'bbs_option': get_bbs_option,
        'user_info': user_info,
        'catalogs': catalogs,
        'password_validation': password_validation.password_validators_help_text_html()
    }


def is_mobile(request):
    """
    判断网站来自mobile还是pc
    :param request: view 的 request 对象
    :return: 是否是手机浏览
    """
    # 返回True是手机 返回false是电脑
    userAgent = request.META.get('HTTP_USER_AGENT', "pc")
    # userAgent = env.get('HTTP_USER_AGENT')

    _long_matches = r'googlebot-mobile|android|avantgo|blackberry|blazer|elaine|hiptop|ip(hone|od)|kindle|midp|mmp|mobile|o2|opera mini|palm( os)?|pda|plucker|pocket|psp|smartphone|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce; (iemobile|ppc)|xiino|maemo|fennec'
    _long_matches = re.compile(_long_matches, re.IGNORECASE)
    _short_matches = r'1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|e\-|e\/|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(di|rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|xda(\-|2|g)|yas\-|your|zeto|zte\-'
    _short_matches = re.compile(_short_matches, re.IGNORECASE)

    if _long_matches.search(userAgent) != None:
        return True
    user_agent = userAgent[0:4]
    if _short_matches.search(user_agent) != None:
        return True
    return False


def get_pages_data(queryset, data_per_page: int, cur_page: int, display_page_num: int = 5):
    """
    计算分页数据和页码
    :param queryset: Django Model 查询集
    :param data_per_page: 一页显示多少个条目
    :param cur_page: 当前处于哪一页
    :param display_page_num: 要列出多少页码（当前页的前后相加，包括当前页）
    :return:
        page_set: 分页数据
        page_range: 页码列表 -> range
    """
    # 分页
    paginator = Paginator(queryset, data_per_page)

    # 一半的页数
    half_page_num = display_page_num // 2
    #  第一页是1，不取0
    page_range = [cur_page - half_page_num if cur_page > half_page_num else 1]
    # 列表定长，指定显示多少条页码，就算是第一页和最后一页都要显示指定页码数量
    page_range.append(page_range[0] + display_page_num)  # 首页定长
    # 获取最大页数，如果原来的计算值超过最大页数就替换
    page_range[1] = paginator.num_pages + 1 if page_range[1] > paginator.num_pages + 1 else page_range[1]
    page_range[0] = page_range[1] - display_page_num if (page_range[1] - display_page_num) >= 1 else 1  # 尾页定长
    page_range = range(*page_range)

    # 获取分页数据
    try:
        page_set = paginator.page(cur_page)
    except EmptyPage:
        # 搜索结果为空时（用户传值过大等）为最后一页
        page_set = paginator.page(paginator.num_pages)
        # 取最后三页
        page_range = range(paginator.num_pages - 2 if paginator.num_pages > 1 else 1, paginator.num_pages + 1)

    return page_set, page_range

